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Related Concept Videos

Antigen Processing Pathways01:31

Antigen Processing Pathways

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MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
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Antigens Involved in Adaptive Immunity01:26

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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
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T Cell Activation and Clonal Selection01:22

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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Antigen Presenting Cells01:22

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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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Related Experiment Video

Updated: May 4, 2026

Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
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Toward a Network Model of MHC Class II-Restricted Antigen Processing.

Michael A Miller1, Asha Purnima V Ganesan1, Laurence C Eisenlohr1

  • 1Department of Microbiology and Immunology, Thomas Jefferson University , Philadelphia, PA , USA.

Frontiers in Immunology
|January 1, 2014
PubMed
Summary

The conventional model of Major Histocompatibility Complex class II (MHCII) antigen processing is challenged. We propose viewing MHCII processing as a variable network, not discrete pathways, impacting CD4(+) T cell responses.

Keywords:
MHC class IIalternative processingantigen presentationantigen processingendogenousreview

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The standard model of Major Histocompatibility Complex class II (MHCII)-restricted antigen processing involves a linear pathway.
  • Alternative pathways exist but are considered peripheral to the main CD4(+) T cell response driver.

Purpose of the Study:

  • To re-evaluate the conceptualization of MHCII antigen processing.
  • To propose a shift from discrete pathways to a network model for MHCII processing.

Main Methods:

  • Conceptual analysis of existing literature on MHCII antigen processing.
  • Integration of emerging alternative processing pathways.

Main Results:

  • The conventional linear model may not fully capture the complexity of antigen processing.
  • Alternative MHCII processing pathways significantly influence T cell responses.

Conclusions:

  • MHCII antigen processing should be viewed as a dynamic network rather than a single linear pathway.
  • The variability of this network, influenced by epitope, antigen, and cell type, is crucial for CD4(+) T cell responses.